Leaf classification
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Transcript of Leaf classification
Focus Question: How can leaves be classified?
Focus Question: How can leaves be classified?
Living Systems 2-2Living Systems 2-2
Focus on LeavesFocus on LeavesVascular plants are composed of
millions of living cellsEvery cell needs water, minerals,
and food (sugar)Vascular system of plants is really
two systemsXylem transports water and minerals
to the cellsPhloem transports sugar to the cells
Vascular plants are composed of millions of living cells
Every cell needs water, minerals, and food (sugar)
Vascular system of plants is really two systemsXylem transports water and minerals
to the cellsPhloem transports sugar to the cells
Most xylem tubes begin in the roots and end in the leaves.
Most phloem tubes start in the leaves and end in the roots.
Find out about the place where the xylem ends and the phloem begins, the leaf.
Most xylem tubes begin in the roots and end in the leaves.
Most phloem tubes start in the leaves and end in the roots.
Find out about the place where the xylem ends and the phloem begins, the leaf.
Leaf CollectionLeaf Collection
Stay with your groupCollect ONE leaf from as many
different plants as you can find in 5 minutes. Get leaves of all sizes.
Keep sample in the bag.
Stay with your groupCollect ONE leaf from as many
different plants as you can find in 5 minutes. Get leaves of all sizes.
Keep sample in the bag.
Sorting LeavesSorting LeavesLook closely at each leafSort into those that show evidence
of xylem and phloem and those that don’t.
How many of your leaves have veins?
Are the veins all the same size?Do the veins branch?Sort your leaves in a new way.
Look closely at each leafSort into those that show evidence
of xylem and phloem and those that don’t.
How many of your leaves have veins?
Are the veins all the same size?Do the veins branch?Sort your leaves in a new way.
ClassificationClassificationScientists organize, or classify, things
so they can think about them more efficientlyA group of things that go together based
on a property or behavior is a class.5th graders form a class based on age. 4th
graders are a different class, etc… In schools we classify students by age.
Geology – classify crystals by shapes and angles of surfaces. Classify sand by particle size.
Scientists organize, or classify, things so they can think about them more efficientlyA group of things that go together based
on a property or behavior is a class.5th graders form a class based on age. 4th
graders are a different class, etc… In schools we classify students by age.
Geology – classify crystals by shapes and angles of surfaces. Classify sand by particle size.
Leaf ClassificationLeaf ClassificationBased on basic pattern of the
veins.Botanists have developed a
systems that uses three patterns.PalmatePinnateParallel
Based on basic pattern of the veins.
Botanists have developed a systems that uses three patterns.PalmatePinnateParallel
PalmatePalmate
Several large veins extending from the place where the leaf stem attaches to the leaf.
Think of the palm of your hand and your fingers as the main veins.
Several large veins extending from the place where the leaf stem attaches to the leaf.
Think of the palm of your hand and your fingers as the main veins.
PinnatePinnate One large vein
extending the length of the leaf with smaller veins branching off.
Pinna means feather, so a pinnate leaf resembles a feather
One large vein extending the length of the leaf with smaller veins branching off.
Pinna means feather, so a pinnate leaf resembles a feather
ParallelParallel
Many small veins running the length of the leaf.
Long, narrow leaves, like blades of grass, tend to have parallel veins.
Many small veins running the length of the leaf.
Long, narrow leaves, like blades of grass, tend to have parallel veins.
Leaf ClassificationLeaf Classification
Classify your leaves based on venation pattern.
Are there other ways to classify your leaf collections?Leaf Shape (Blade)Kind of edge (Margin)Kind of attachment (Petiole)
Classify your leaves based on venation pattern.
Are there other ways to classify your leaf collections?Leaf Shape (Blade)Kind of edge (Margin)Kind of attachment (Petiole)
VocabularyVocabulary Classify
To organize by similar properties or behavior Palmate
Several large veins extending from the place where the leaf stem attaches to the leaf (Palm)
Pinnate One large vein extending the length of the
leaf with smaller veins branching off (Feather) Parallel
Many small veins running the length of the leaf (Grass)
Classify To organize by similar properties or behavior
Palmate Several large veins extending from the place
where the leaf stem attaches to the leaf (Palm)
Pinnate One large vein extending the length of the
leaf with smaller veins branching off (Feather) Parallel
Many small veins running the length of the leaf (Grass)
ContentContent
Venation Classifying leaves by their vein pattern
How do scientists organize objects and information?Scientists classify things by putting
them in groups (classes) based on similar properties and behaviors.
Venation Classifying leaves by their vein pattern
How do scientists organize objects and information?Scientists classify things by putting
them in groups (classes) based on similar properties and behaviors.
HomeworkHomework
Read Classification, pg. 105-106, and Summary: Vascular Plants, pg. 107-109
Answer questions for both articles I-check 2 quiz on Monday, 1/23
Read Classification, pg. 105-106, and Summary: Vascular Plants, pg. 107-109
Answer questions for both articles I-check 2 quiz on Monday, 1/23